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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c20f0bf464979f0b8759890057684c757de0bd2b382f93f458f223c7ce96f11' 
  AND token = 't74OvEtP57olDX3HcIOFk0upCOXoJCnG9Hz6WUC+Des=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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