SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea2ec05fea9360c0b2b0f68f8622fbcff7b4a1ff308e4e5af3d88309b17c6626' 
  AND token = 'cktGau8McinYEHwgjTx1D8M5ihzXfrqnECxiTrQKpdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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