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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f077f053c990aed0837b84feec5bd4169bc0a7d060c704b158cf4ef786f19ba' 
  AND token = 'CvyPCBYiMKAQijD1LvdnXZ9zPDFZmY9DE7q1zvgVTfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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