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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17db9ecabc90732d52df72109e954ee8d710324ee61377c539cd0618b413ac5e' 
  AND token = 'uYg0T4da2J6zS1PE7G5iRYEnr42HAEDzHnBqkJjMfUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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