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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b2ebaf000ade41a001359a9fc97aeaf6cf62142f8d28844b737f8c27bf57f7d' 
  AND token = 'ExwqFBfcffX11p869jcOBQdDHw+Oq1f8SaRQHJSR3QQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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