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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4db013e7ea2f0e8ce8862c7eeb9e9b8394b66b636feffa0cf2b22e5eb2adaac' 
  AND token = 'IcIHe8+UBOPCWRgYC3jho7mkWzvgyXfeFpXIXay04jU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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