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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab315b04c75ee0747518f1542f700e83eccee56f9578e798b836b69e0ee49078' 
  AND token = 'ZwDITIuT1C7kLgtynMWb9Y7lxBa/ju/Sh6QaSYsw7jQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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