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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '528218cf0342303bb62cb00579420ac2f1e7307be21c3a36b63259d136799530' 
  AND token = 'i7SCXBVv8fIeLpBOEFD4YUuQXRYTC2o9ag9g4Pq1lTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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