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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b029ca0ee8e6bb31d039fe0e1ebbdd67dc995bae9118714e92bd10100e3c9f0' 
  AND token = 'P+lOoyUywekcpem4UiUukzrctS/hJp3a5ZABpppiwFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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