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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b6119b5708fe1e139bb7f89e7493cd98f3a1e7b73151d735c850def98af359a' 
  AND token = '/8PAolrPM3Cejo8Qm/A7KZLY3vpoxkPF9/Qz/I4wfC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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