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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16196c86d3749fbf98bebd8272aa32bed7cc44cbeb91b6d8c118f71f888f07af' 
  AND token = 'iTB3QFiUyoTN1GOPpENOUwED9Ynv4Wsd9OTTNlAF+QE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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