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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57e90a6d73a6d2ed7e5d3f8a710b913bcd7c6af7b3982da589f126558c1da231' 
  AND token = '3QcFsQWa0ye5amYBZi0HZ1+TtCiZYp3k0feCqL4IJrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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