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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8574ff07de24df6d0dee17ea080551fe81c29e7d03a944ac5a2c39a04889a1c0' 
  AND token = 'EfAwiCHPBcSu0U9TIdk/HW1EB8GBJ5ClSv+NVzjASVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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