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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccddb02f340253f844b3a452b54de44e133d66e2fc586dad379ac47403013e57' 
  AND token = 'Xr4EV2MlQLsOUd8eI1Hos1I178yN+SRqEsVmg0U9xh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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