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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91bc0ecdbcb138f3a80b4721fbe7a2c7268875041a2a2755a1d9953a6bdc3862' 
  AND token = 'ATP94aR/s5mkM+kEB9Q8yAL7Y4DWN3sbFFqOE1tCt/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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