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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '522d86be69f84fbd757d4366de0b274a17f35b5c83a58583837d34e4783d105f' 
  AND token = 'j0og9PF4Tq3oVby3wTwaZeFUAgpy6UkexQt2egd5pQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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