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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4e1179f20f5b7b4da1ad5a330a9f59e59fa1f1ad654c6c3771d682b139a40ec' 
  AND token = 'sqdaqluGWCzUGs+hRQ46exJJF9OAZsactLTR6xH+k6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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