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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72ee153cacaef56a94fb1c4bbafac717b351c832cbb91d9c79f3b4be2c7a0114' 
  AND token = '6kFV2zwiEN7EFL9AYmJcsUY/0jWWZoVtFRLeDjuQaxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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