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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f45c8dd674ce533a3cad0f090726f5d471e0f4e4ba73ebd43d526722aab55d64' 
  AND token = 'LisWXG1NEht8iMhEY49SJbcIbc0B23KP5C6strEA5GY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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