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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c95785da47c6ea8ab09cf48cf5d1c3c362f42f52f6fe297ec49dfef0492f260' 
  AND token = 'ujTfa+qK1lrUi0NJODwxQkfEInNjewi7CDDQqn7rCKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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