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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d45e54d61947daac22276059231cf1b2d6fb7df6ae32b35666dc0ce01563d95' 
  AND token = 'OdWA4O/iQ5HxksagTjYv7AyLd9nsDGlFfzhJKKO/YvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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