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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7036873debc2513c5902f518d1f5fe4edb9490a99579bc312509ddb2a6cc082d' 
  AND token = 'ZMUR3moQaruORlBNi/yb6CCbkOsl12+56xocsbbWZds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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