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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90c123c24c6b5ace0f2e0ac0b4dd028e7b9ea89cf6bc37d8b30aedd1a24ce3aa' 
  AND token = 'z7RlHAHhPjWoXOGahyYc0JrWFOClrjs5UbdaMs3umfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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