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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbce65b69b7f10cad4480b1dd78869e454b8344ca14c745219ffec33288fddef' 
  AND token = 'lUVIIvotM6TeDjv1hKgHmnmbV8EUOFhMOTXdjcCrsgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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