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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8a89655759ce2305f03bfd661d7ff5f113cc73410ae92adbd55c312d599125f' 
  AND token = 't83py+u3Ccsp/awJamRMPdGH+mtuvDju0f8TAUal+7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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