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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41e1f1c51402c587c7813e949fdf0f815738896267bb8057c05a2f4a71f20cd0' 
  AND token = 'KBnAg5JP8oNcN5mBbfH6k6Q0DUodPrUZRLLxQIiqkh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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