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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c5a32e815e1983e99da90677ccd5084caa1564f599f20452090ee5b0551cb96' 
  AND token = '5W03Wu2TpneaxJpcizSuCFiA3HMD2Bpvq0SpRk53Wx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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