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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7330171126ab9b822e866e7dd910825b4bca7b8c37fe28a0d6eda6c5660bcc03' 
  AND token = '9Kk23lJc/xqaibhZbGjx6XbL6mOnz8C5A5RR5AQ//8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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