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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2913446d7bc5c8cdb4bda0798236d1eb4989db212ea89ec21724487dcba89918' 
  AND token = 'tz2VmrpP7AjVnaQioGQmOIHzsoXGdoAll/Wz6ZdDV34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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