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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4c74844cea732b64b4036975fd0ae5f0a33846fc85666fbf014e1a9fd9b80b7' 
  AND token = 'uce/9OZEXInEcqPD7YFDH29qdHssqPtzu7dbAAaLwD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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