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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de6075fd120079fc67957d910ed196a9074ed8475eb9ad7932fd924dd5fe5670' 
  AND token = '0aiXFkdsYVfh9aMMeBGpA9S3RKh9q9mZt1ZieG6Iwa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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