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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '168acb4a3f6e99b845a660a0c7eaa6657054ac384a0066a909484698a788504d' 
  AND token = 'WpsvFBAeyLBmDKSS/qob5Azn2/e0vY6HSELp0WuyY4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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