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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '325b9fd9b424c94e5742b8f087795f4939e9cb4d1e8805b6c679a5f92a94933d' 
  AND token = 'wCzu8DWlemTcICYfV9btCoVI2QX5XzHj2vHAWlCs1gY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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