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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de1b8745943bca4004bed0c1421e6366452dae3255b43242b7fefaf57f43d3b0' 
  AND token = 'qWSvadA6nGbMObad5pNtrJD8tva8RVsm/OS2KfgfK6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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