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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a47b6c40ced4789b57ee0264face48a1956d7f1076d05114e8221b57022c16e6' 
  AND token = '8C6GICPQdOSaz6aRotke2e4nHukL3xIUD7fH+Ll2ozs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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