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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09ab7fd2e30697077d71cb3a8f5a6c02780ef0e68c722812153d36c35bbb8011' 
  AND token = 'Urtpmjjod24HLX/UQPNUj8Ty2Oq4sbVg+VwWO3RQpZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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