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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c07efa9827dfee615732c24b8f04ac61c7ab57095b6998dac89a54e1bd0b082' 
  AND token = 'Id5d+iF2MKZuqRe0jWQ8Gs8ot7MePx5eJXsowQgtB6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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