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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aa6bf19f0ad8572c5963184ad3c6233a823edf9ba9ba719768f7eb30f990464' 
  AND token = 'oX2E0eJzaV8X02lEK6xhhFR5Hb3QYFPNZMb5M/E467I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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