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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b2b0fd620e739553a1ae74fc88c2632d85f377f68c04c21fe444850c6fdd3e' 
  AND token = 'AdxHn5wcdVR7WXAwqqnUGgrcKIBRyJfNhc1p2WVwbe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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