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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f170365a82926b03eb509855092df180b3704b9612a172c5c41ef98296b16d7' 
  AND token = 'Y5E6mCuOIwBqNNxAJII3I0+imhJx4XEIugWNnsDcuKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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