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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df634213b098d156f413948c821e4531270c5b517a3d1e524cb30fba1205bfd1' 
  AND token = 'tmO3YNczoG7zlDbh2ZS/T98kP6mKZoFiIogx+enwS10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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