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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9054d11855e2123ef50108ccffe353c38e52ed597a79a7f3d2814c74cf363181' 
  AND token = '7uqdxisWbRk0MswYO3k4VYDmIq8wv8fdwQ6TcseHyWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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