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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcbc82dc0fadb56208dc703ca00d7690c463a94a7999488c89ee9ea6e7958d94' 
  AND token = '9c7bSvn7Fw1NZH/1EPCxKSyXBPWE0pl5JL+MAsUCQnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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