SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa672a25b0d32a9e4bb3bbb75298dc7457d3071442586836d390f77906a80c55' 
  AND token = 'B5X8BK0Bz1CUfguM3zAfaQMY5Jru/W0j+O4mRtxLSXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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