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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7834c7fe77c4ef18e05a27ce69606464701fda1cb331fade2896ff54d992326e' 
  AND token = 'WFafzTah19NH+h2tiWaLLM3WZRa/iJ/1xHK5F0L45FM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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