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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdf4b1479002c0b682baa1ddd7cbb119c8bf4ac452b25c7a19be6ced208a8077' 
  AND token = 'MYToJxHv3+6WtqybF1Zbb1c8r6TczFLvfl8CfNKnxlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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