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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cd53f156de86c93c908b39f470e734a4fb5b06caee8a0de6ddb25caf8016691' 
  AND token = 'Lc61qufV1L7antIA+CpPxGjgD0ePBSa410U8vCQNJwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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