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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f4a075a8390e9d15a7afe3273d4d8626156a205928e90de806af1bc9abe636' 
  AND token = '3AJcMqBS26vtcoO403fUdNh8xdhJLJDR5uMNKyx96f8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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