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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b37c0e7784b21ffb29cff22bb90cb6a8459f34e9b2148f3c8f10f88b41d9371' 
  AND token = 'c9OGEKTZ6SNaeuiNT2loaMfsGffTUPQCbuf+lw/S3c8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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