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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '090b271852198ae24b7ebb8533533a3005383f94a02f6f3c03c567d8d28b8038' 
  AND token = '9jFoOVs5oNpu8MkjAndWaqzGvFehfbrKjI2OWJGp0i0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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