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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c191cf35ed3756cb1b35dc52ba9ac397f48dfec043645823a645ad502598c881' 
  AND token = 'Hg0+kTxkDXbWb6UiWiELbzbwEAC+X4OC0BV/aR24apo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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