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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afce778448ba24bbbeb956defb7521467508fddee088f86b2117df5183c23ca3' 
  AND token = 'tpOAj5zGs2ANGTASBdS1RYvLv1ezf06yt8Bg/U17YSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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