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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a542743e21593ddfc5dafa1c2b1231b1f83eacbbce0564773a3181186c5776bb' 
  AND token = 'rnLkcekoLVh0lukUOgYiM1Jm7v7b8sWENDaWfBFL+ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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