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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24ac9751c3d8c1d3165af5d4c98662e8653f0ada2f1e93594597287e98f97cda' 
  AND token = 'OYf6R26U/uIjPN5+kbRF4c/YwhRrsklziHS9od3cEMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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