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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '967871c80e1e3effb730df853c6fab64ff66129415a420615ed150f5c32ca6c2' 
  AND token = 'rPqK2akr6B30R84IDNZaeWdMSMBpe1Mo7sWfZopAvFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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