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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83f46a44aeef9b82d74e661ff15406c9608c37ea108ab709870a55af2e59e019' 
  AND token = 'ZpWiVMwhuSEDCID58qAHQbmQEL/Co04XtN91hHTOINU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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