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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dd1b208f2c1a5cb46f82dc647eb0118de984e41069dc0f5f1fea9f3657ae66f' 
  AND token = '41N8Sa0ZtgC3lQLL7izF6sWn+2TcOKl8u0I7nJXSH4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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