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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1f731068ed6204e91d36a18e7711a9bc1aca006d49e41927545ad686d581a36' 
  AND token = 'kpwJSzzu9hOIq1xYgb0ABSNClnM6c+n9OoYnJRAzDME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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