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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43af64d5be9d6af667158e42b4fda7932bf6d44b43115250e537dbef7b0d9ff0' 
  AND token = 'iLaoEvJXyFmntBv1npL8J/tFEPzJFDLjv7amNGdNIp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}