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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c4d93b3cb6461e1a01c29d7d5ea582eb7adce50541973ba2210eb604c711b7b' 
  AND token = 'MrdLkYHpB6NWYnNIMRGfST3LydBxjd1hg+AORKQYG0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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