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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25363bf0485e281a5a792a6a7b87b37d5ecde5a3c9a5c7cdb6cc87b63cf916ce' 
  AND token = 'gPS5uJux1KxDY/XI5wPei6mIjGCiaoOEU31v7AD5/4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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