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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc7feee368e9007c578dbc03d9d746b1af141f91257a0bdaf5df0356f3d6246b' 
  AND token = 'tscry3cZdoSz1e1ICmF4F/lMZjicUQbo11Q2SPd+0BE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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