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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2b08cdb2d987d411f88076ff3dad55494a7f7e509e167ff5af38a9267f49f0d' 
  AND token = 'hlaBjZMc/+Q4JuY9efd02WtmCkZci0rBWlCECS852KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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