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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00be7df50a481719a05cf4ad0b09d27450850bfb379c4843a437b07de0e81085' 
  AND token = 'y7/J5j4QLOVlAtZyz97iznEGeFa4Cz0VQv0gY9lNGu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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