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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47da98b3ebebc8a97b6f5a240988403760fa854b6fb2fb24dcbc2e80f281552b' 
  AND token = 'EVO5qSBPvKnt03f0SvSoZAF8Wq/JZM5i/+KtawLFEfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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