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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74124b3f14150f0ba83caf7165115ae14bc05d55e6dded631a4ca6ad8244b213' 
  AND token = 'r2GMDkzjri+UoglH9bSQ4fj2CPQP9E0R+JIpQFSblm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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