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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f427a58f1797e0f9775b4ce4f9c5e7db700103ab379c33779b8b8769e90ab7e' 
  AND token = 'jUGDs37FNwKPiKLI3W65Ch+9riHq+5jArhUqGirnx5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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