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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06f8286ff2bd73f009ce240b39b45637518d02e9442da7c0c3bb76fe7aa63baf' 
  AND token = 'A0OnkVo9KfUCsEZ5xdi3jlZIaJb2eU0wfsrQ/yRq1LQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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