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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9822acb4dae3eefa4e6537dbb9faf83af85c5141b6c4f7b3768d454e43ba29fa' 
  AND token = 'qrhBR3nHSmHsUr8dWHWNr6q/pytc5aUteyRSiUJAZCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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