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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da27de4b69a9588f3ecd6483c58e57573e73a6d7ce661e251accc54902630998' 
  AND token = 'YtTgzTTa3r30gQEgxiueQST/j7f1xGwMr57bOj0Llkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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