SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1a8a17aac4efd822e69f69cdd5bfaf432753a77df0ea8b4e8228be327dcc25e' 
  AND token = 'NqRcTKjz9PjnBhhvsd//mRZ9VJWDYtTrta7R1QvkgQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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