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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b541ef20b579183f648d06c18117bac75e4b5d4301ec50e5cf5eb38c0bdae6' 
  AND token = 'gvhRxelH7HFrHx7HpAFmgJCLV3XGQoHKV2SI0fzzi6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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