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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a130bfa47376ae7543c6f7b0526fae5985c61cad4591f8973126bf38e4bdfad' 
  AND token = 'jEKMMUNHx8UOM8Fi3j8lbb2VDHedzve5iazpBI057bI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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