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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3428bef76c0c577ecd4e4644d5cf8c876ad20d6d72193a00b6925dcbb0581d7b' 
  AND token = 'wy9TiJ3c6MmbI4APgiJzT1APwVWdgbbRzO+EwwWNI58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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