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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aedb298a119dea1c9a0974b449c76676cfb5fe3cbfbc83d7383f664f6bc16c69' 
  AND token = 'vLx9Rltv/V3po7jhQIbIRSi5wisjqPXvcjxVnNyCegw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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