SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37280ea6e78d694cea01738bf2dbbb7d0f8f4547feef710f5459b9b0664a740c' 
  AND token = 'OWaCBpPYuVbwk3xdZWewVqX3mLPZS98DmZU/Mlj+IuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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