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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b5505c794b8b3f05359c56e226816a5ba9409bc4971b53510eb2caeca581ee4' 
  AND token = 'bzq4agVWBP0ADwXLMky9s/DUdbzjQnzDKuT+kWu3SKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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