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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e404de465b866c13cf7680d31a8e8e1b7d744923bd7c2f8109d5ea4668426ca' 
  AND token = 'QCOBjQX1OCf2Rusrt+MF3idUhCAJPTJEtG8Iqv7Pulg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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