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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f61f03abab2333cb957749e3b260346c671ca82c32a10eaa3c402fa6414db1f' 
  AND token = 'dsWO/Tb8Ww04d8ZcdAGCPmPxPbP8uSzKofLc6pa5pVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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